The FBI and the Justice Department have been investigating a series of bomb threats directed at Jewish community centers and now the vandalism of over 100 headstones at a historic Jewish cemetery that was first reported early Monday morning.

Investigators with the University City (Missouri) Police Department are working to determine who knocked over or damaged several headstones, according to KTVI- TV.

The Chesed Shel Emeth Cemetery opened in 1893, according to its website.